def _ContextFromDC(dc):
if not isinstance(dc, wx.WindowDC) and not isinstance(dc, wx.MemoryDC):
raise TypeError(
"Only window and memory DC's are supported at this time.")
if 'wxMac' in wx.PlatformInfo:
width, height = dc.GetSize()
# use the CGContextRef of the DC to make the cairo surface
cgc = dc.GetHandle()
assert cgc is not None and int(
cgc) != 0, "Unable to get CGContext from DC."
ptr = voidp(cgc)
surfaceptr = cairo_c.cairo_quartz_surface_create_for_cg_context(
ptr, width, height)
surface = cairocffi.Surface._from_pointer(surfaceptr, False)
# Now create a cairo context for that surface
ctx = cairocffi.Context(surface)
elif 'wxMSW' in wx.PlatformInfo:
# Similarly, get the HDC and create a surface from it
hdc = voidp(dc.GetHandle())
surfaceptr = cairo_c.cairo_win32_surface_create(hdc)
surface = cairocffi.Surface._from_pointer(surfaceptr, False)
# Now create a cairo context for that surface
ctx = cairocffi.Context(surface)
elif 'wxGTK' in wx.PlatformInfo:
if 'gtk3' in wx.PlatformInfo:
# With wxGTK3, GetHandle() returns a cairo context directly
ctxptr = voidp(dc.GetHandle())
ctx = cairocffi.Context._from_pointer(ctxptr, True)
else:
# Get the GdkDrawable from the dc
drawable = ct_voidp(dc.GetHandle())
# Call a GDK API to create a cairo context
ctxptr = gdkLib.gdk_cairo_create(drawable)
# Turn it into a Cairo context object
ctx = cairocffi.Context._from_pointer(voidp(ctxptr), False)
else:
raise NotImplementedError("Help me, I'm lost...")
return ctx
def _ContextFromDC(dc):
if not isinstance(dc, wx.WindowDC) and not isinstance(dc, wx.MemoryDC):
raise TypeError("Only window and memory DC's are supported at this time.")
if 'wxMac' in wx.PlatformInfo:
width, height = dc.GetSize()
# use the CGContextRef of the DC to make the cairo surface
cgc = dc.GetHandle()
assert cgc is not None and int(cgc) != 0, "Unable to get CGContext from DC."
ptr = voidp(cgc)
surfaceptr = cairo_c.cairo_quartz_surface_create_for_cg_context(
ptr, width, height)
surface = cairocffi.Surface._from_pointer(surfaceptr, False)
# Now create a cairo context for that surface
ctx = cairocffi.Context(surface)
elif 'wxMSW' in wx.PlatformInfo:
# Similarly, get the HDC and create a surface from it
hdc = voidp(dc.GetHandle())
surfaceptr = cairo_c.cairo_win32_surface_create(hdc)
surface = cairocffi.Surface._from_pointer(surfaceptr, False)
# Now create a cairo context for that surface
ctx = cairocffi.Context(surface)
elif 'wxGTK' in wx.PlatformInfo:
if 'gtk3' in wx.PlatformInfo:
# With wxGTK3, GetHandle() returns a cairo context directly
ctxptr = voidp( dc.GetHandle() )
ctx = cairocffi.Context._from_pointer(ctxptr, True)
else:
# Get the GdkDrawable from the dc
drawable = ct_voidp( dc.GetHandle() )
# Call a GDK API to create a cairo context
ctxptr = gdkLib.gdk_cairo_create(drawable)
# Turn it into a Cairo context object
ctx = cairocffi.Context._from_pointer(voidp(ctxptr), False)
else:
raise NotImplementedError("Help me, I'm lost...")
return ctx